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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afaa35d1785d21238f4ebd452fbaf21e6f12162bfd2a05b8bd2dbcdd88e0e26' 
  AND token = 'rFEjS+O5dVkkXQMmIcs9a7f8Go29j8xfRulNV12nMJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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