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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c054bcff224b5bcc7acdbd185bf70dbe8be6855b39665fdf3fca21cf58f95891' 
  AND token = 'iNHXlo7VCJLu4B2fDIRaPYRSW9VfZKkfJdYWJh9QpP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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