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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238ac8c7947743a3d15b68c7f8f1eea2edf24d06cf6787b644a4b21b09d42766' 
  AND token = 'CJk4EVZjtisyfrNLuquEN3WAhXZiMyap73Tw5Z1wevo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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