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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd063d994510ba9a7d0d985910746ed29ef93a4b8b4d8fbc2e3e436b4858ce733' 
  AND token = 'UUVpJrmX9YrYZqW03WtKdPXz3fSUMCFVJYXvJVq6JOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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