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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ca5f77cecaf987ac20f9636c954a61cc011bf8d814ec65af94bb3a6ea4dd33' 
  AND token = 'Ejsktx0gv3QZUMTK73jMm38gq0ouylOAntYR53AvyU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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