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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9808c66cf22c2bb1e7f42759c3a259662df3faab3323d0bc112c3f073efc9733' 
  AND token = 'dzOIG1WfGE+68gHpABDIhIFMZ+n4JUalQ051e3LiCes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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