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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18f5ed68e09bab707b8476483cb6382bb22c17fe9a027968a7907279f268b4a' 
  AND token = '3InLoX5kzJQi+IbxRzEouRooNdjFbFkQ3rFxrQW1mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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