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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f9576c70971945a5b66221e39f0583a6251115bbf329932f21557d6b9b101a' 
  AND token = 'XYnIl40TOXZ3/Y5wP2po+uXehsOCUvKetfOYSYEoHpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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