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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075a34c317f692da3f4e487969e89ba8979cd765be10a7e2ec3dafae41e8ba62' 
  AND token = 'E0oV67lmYWDAtWUOFrjxUTI5Olo9iFuKtjYbeWC/s9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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