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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b607bc785e28c04e4a482a4ffeaf2fbfcf0a949d7dd7272b2641e5da6f52bf77' 
  AND token = 'S6pSXrgEX82g0faLC6D/aS2g5du1p1peT8MUP5++juU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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