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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecf4572c25708ee065c769fb50feebfd2dd588824d9b4380c60e0e0c3619cd5' 
  AND token = 'd65+XAo/JmSoZuICXzbnUKaYaGH/EhHVxAIq37tkuL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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