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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3badadd06db4f9b1a9a5f68fba4ae0475630696b8c888c1655acc80762956c0' 
  AND token = 'H4oJ+LjZ3aZv652FTZJ9jNjFUlntvmiigqWzGtZTWyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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