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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c584a9028e32370b349ee727786c3d9ebf5fb2d55b05bf245a2362fc1eab6d' 
  AND token = 'nD+rWF2bNZAdfKHFezudppNzr6zvchKbm7pwsN08xJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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