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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feebbc437a9d1c907e743278a3bf0b7397d37da75b3e0d69475bb914fa284a0c' 
  AND token = 'Es/cM8vvnu/81HpPoiAbqiIJhvhFYSBzt/BFDy080LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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