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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f0434a3cd9d40709ad24d617dc4b1e27cfce9d0105bbac7480d01489e14050' 
  AND token = '3g6m9E/7EiP5bhCpfIgtXskocRzvzENlUwzry1lkrBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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