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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3af07ca13a79ac910af1354aa93574c1104f7ca5ba4d1bad00e45cb98d3533e' 
  AND token = 'PXVgnuD1f6yvfYUg3/7ivkiNHc20XeqVtFe8ig4wdNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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