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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4aee2540eb1079b719947b3df174b2eb30a8c36c35133f22ed99466a6c5f3f' 
  AND token = '4MVY8Pd5MucM96kzZsflaXpFiWJk10DEJmVMach6G6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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