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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02dcf8ecde965fa2a013cb9252e8cddeeb9dc15a5ef07977d9b4d2e04ac9dba' 
  AND token = 'F2hwrWTR4iMfjadCkNhgrqMyOOTPRkmMfs6EAAw7nK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}