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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ab7cb52b858ffed5204b00275471e2d829101fe5ac93d3a3c4b7f75ccf4cf4' 
  AND token = 'TNfo8d/eq05auKwXzOrfGcNUG31uhVnbLegWp/WmEFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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