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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268fb0e86e770ea39d7c1f245ec0759705a6c6c24b3a353b93ca539929fc746c' 
  AND token = '9C4TtCoc6cvPlIAB+i1++xQ/Lme6C40hdQ5zbhYKT4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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