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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5cada969db52c0af36b3177de13580d499c352b715275bc8a96664a6d40bd9' 
  AND token = 'khJfgGE8h6ocQa/uOcftG42GJzufteQYBmVucWQyuvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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