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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87ef63112455194831c962ac2ae23f31c03a1128e2c29de29f48690918e256f' 
  AND token = 'szDevgCLkwoWoY7cIfh94JVFD3jYV5tMUhhIB6zv0sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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