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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1230f7c548b7f027880f1b49279d50ae7a3b7499c8977aa7b2e4d3971526af' 
  AND token = 'LRvtTzXLTHcy2PsY5FKF22OBTdsTJwYhVut8AYRNDpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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