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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801b2d9d143d8a526dc3ab085410a522eab2e7fa339146c688e2ca2265e88816' 
  AND token = '5mzWtSHJVPNBI0Qf4B+JaP7H1ykH2IipdMRJQW95rqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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