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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3df14320e83e262a6bef70ebea179c0760fffc7f16610354668575973d5ae1' 
  AND token = 'XWzIAshvZUdykJ4i2WWJaakg+HK8hgkYNERFvx1ufMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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