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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabe2ab0c873a9358fca9bba98f2190254acd9deee1e7e6b625d2428ec747c79' 
  AND token = 'PX25u4n33XQaAHs/A3ug9vVXE5fu6qp9V+QhwjRSm5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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