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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e8f8395c42c761e55695177fd63b1a06aa5a7fddd0060ddcb6ff03af8f8259' 
  AND token = 'g1yxHdBtV2MB1UFe4ahrN0szHYHPblwTzoCxYA11ScM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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