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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12639ba1f1645f5e99b879c5a60afbb987ee026a0063bca9551a6c3a3b400bb3' 
  AND token = 'aJREUSkUrIAEMKhFEFtchy1kVmNX+Tc9b5Yg3/bn8bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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