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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a39eaea33dc2bcb3f88c5a9876575d8861d945380ea0f987f08a3a2cac76f2d' 
  AND token = 't0R01/thiWSmZ23ZHwy+ATouFNjQ12q+xWBV0HbIJ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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