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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d76bc1e809898c23b13afc72f4209916e9626811b808cb63b05ecdd8f3722f0' 
  AND token = 'da9VnqI07OoSSjctKp+iYPFdMZ2EjE+InInYw2/i6iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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