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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc80d2ae41c73135c766ae413525cf65abb887c01e7d1bf2d884084061ef2824' 
  AND token = 'Zc574EoMxaRUJXxptVoI+T1CFN9ZTrb0qeeMknVRzVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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