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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0503263e8adc22d3a944203a267e00eec60e5ffdc51f382f67f482c31eacb09' 
  AND token = 'ItabD7p7EPAg1wPiylSqu435n16F/eAMMb+FIs9hTvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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