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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3012820b7709554c67443df2add296c242842186ed2d38be5f139c6611097176' 
  AND token = 'QB35e9ABXpOt0xZP8ph8m28CASHBlxk9XX2OcxBIrqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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