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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3bdd186bcd9bb02687f0a52a46df1110bc121d6f34b2708002e53bb95df580' 
  AND token = 'XsUv4V04962LMkAuwuR5LQVE661w0Hw9i7P1wd2H8yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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