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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cb83a6c2a67af00e7b9a2bc8b822e3c9de89079eb51b48ea6edda15db243a3' 
  AND token = '+Kn6op/7MAEsNnshTt0VE12a/B5cTTaD+AtuxwwBQaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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