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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff8e431fa4c059efccf26c135a9275593f9496455e377ef36ef58011460a3a4' 
  AND token = 'bSZ3X9nKbmzPCZzj0MMxk/5zHQi9WJj69Z1qi5/Vw10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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