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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b146fa43941110dffd7906a88350b9e68fb64977345d2dfdd68f75862651e9' 
  AND token = 't+ZU8HMvk8arVFp2f7f4JK3T1rosl6rk6xeMyJWt0fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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