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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7522640702a6254e646cafd400e99342db1bbd98ba8d66e2cf8a1c215a2c05a9' 
  AND token = '0EoGKhoNMgqIGDItDlBrovU4s1flqN1j50NxkPmUrzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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