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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb0b9c9f98285fd46ff516eb8042a6c16b2b4851b7e0363ed6eb47b37ca52e1' 
  AND token = 'e0/u0L/H9lyjOnGr81WO0yx+X+h/1oRF4ul8TEBsfEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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