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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c9131a4ef2410a3f6dd2ebccda3a2d4688174b5a4fadb6d4895bf8f1365906' 
  AND token = 'e4iWYwhraZwuaEGFCsNNPYa8Z3JG9qTKEH3ZUHNAtpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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