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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b95c91b594175a19e1a8309211fe888c317eee5b2626d0e2fda9264d396a68' 
  AND token = 'vhZSZuUaqWM2T3P54oCUX9On0Jap/sc6bGIk0FcWD6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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