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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dc445b79f37848c920e16bb689c703d591cd1f997d67b92ff944c1fba5e8ac' 
  AND token = 'IUXcBAoWcUzxae3mxDTAVeA5Jimhbh14P9X51FOp8rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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