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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e066c96af27754e47c698d67919378d8acbec16e74ef049a7442d6385fdd4b0' 
  AND token = 'hvjnGYt7R5ANVAtG2Lg8ZYk7WgYyaYKzVOaEJOQnWjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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