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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765ee50f96205fdd7ca991fa59dff64673f695a2b873efe1f997db378719d69c' 
  AND token = 'VkvwKnlb+7/8kod78TVQPvRdMWmbRCY2uttNIvPHnrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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