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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0835d62539e9ec2c9272b8629161e10d9d6537f5d9db3d360044fd028ded668' 
  AND token = 'vGmOMuBPC9lsUe9eaxdhvUocR270S8QAnRoUyncXgzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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