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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1cfe3fc407f5a6649012924b90b762e8a9465b3c549085da13ab33389de8d' 
  AND token = 'v31ZqVZW6O1tZnPbXFPG4ungAemlicY6KC5HTGM8NH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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