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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3a5e6333b6f44ab15262d6d1966b53baabf4751ee0b92b79fa802508088dbb' 
  AND token = 'ZJ1PhmAtIE8hqYZhdZdn9dvGOgOXa9WHDuCsChgA7Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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