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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d8a3939213f0e07578b6d2876738d7022cfefce66024eb15cdf775d63e131d' 
  AND token = 'OxRlp9kEw9JnNB6IFqQ9z75Vp8D8f4SNeOs7zKzvwWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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