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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec618df7411d3840c4c2af98862a26c5a29cfafa815c4a932d64bba6b17799c3' 
  AND token = '9ZtBasn0PBBW/OKLbgR5z7q92gb9/HeltsjG4Q5a5MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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