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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0777cbadc26a15caea8a7e3cdafb1ff17fb1b69b2f94138fcafca01ddb232a' 
  AND token = 'FFJrUS4DxYQFS+W1JKnbZQBqEhQUI9I6dh+iYq5eWzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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