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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b769444ad07c1367bcbf290e44d24e9b8c89df5859af495462d192c2cc0e64f' 
  AND token = 'A87rOChn5K9JYEkOk9DBMAfhd/8WXviewxNr19Rk1Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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