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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbaf0188544a5b0d9bdd7b48061afa67af10f00a1b460f9aa0659fa9c1f10d89' 
  AND token = 'e5YUOU//jro9UmvhhuTtK/SpOS+RxyxHIl9YldhdoMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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