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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87af8148d19652adb32510c8622c0d2e434dae2b4c6f48b8857d2d4a56c95eac' 
  AND token = 'r40mp69BDV1Kq+7Q0seYYx0e25ky/rTp8Kk2GSlsXUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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