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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de5cd6d67b877f742e10d9857dc47da94e7496cbf8e2f59aa05be6f7a35676d' 
  AND token = 'nge4KPQDcQMcZ27PQw1Xtv+gBrjhFe5W1uPfaPKXElE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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