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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef28fc519ea11c28e3bbbe0ab7b1f70066d0b710a53a225172a2ae7279428a6' 
  AND token = 'coPNkyEMG3pVr15kza+yFgOsy1AOxL+r7VLZZvO9TDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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