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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827755f11c888a251c3c5f9154ea1cd3238704cdabc9147e98d6a00a00f5dde8' 
  AND token = 'nS4iE+dtOvNXlLB83GvnzPl7DW1JgIzol9+Nox1GF5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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