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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d97960b12ae57f6a3458afff2710fa1e649eee3fa7fad4aac6c2fd25df7ce6' 
  AND token = 'vJ6KvgY0brZsE1AmfOR49lDttlKZuw110rqit7mg1u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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