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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3695522694dfa6c45837a3a0b03edcb5516c58704ff527024d848cfd01627cc' 
  AND token = '6LCW95A16d1g6R0oscriPW0JDzsA3e+Xyqx+8LS+5V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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