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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37b85f368b3712076fbd0bb9a379e45bb8521fc1209d318a9de7eff13234839' 
  AND token = '9kj4EWFSyH7VQoSmwTb74pyCPSD1HqXu6DOQ+hKJO+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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