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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf825adeab856b50b56c06a8f69b2fdce1b8d1e665a0c67dd612634c90cde12a' 
  AND token = 'GMQSPReBKPaEo3GaDw/D1Kij8eUple5fm/EZiXG4o1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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