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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408e1cd43e8f31ec9b0296ee1b485f32bdfa6086fe1fc20e9afcc1a88604c038' 
  AND token = 'vGtjYouwggC6nNnNs1+jJwNyBxwyqLY1co8kBzAUvr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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